Astronomers/astrophysicists have been talking about a gravitational lens.
In rough terms, that curves the space (AFAIK) toward a large massive
object.
In this photo, it looks like there is an "anti-gravitational" lens, as the
space is curved in the opposite direction, away from an massive object.
https://goo.gl/9na731
(This photo is not mine.)
... or it must be a PS. ;-)
Igor
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